Phosphatosaurus is closely related to the Cretaceous genus Sokotosuchus, which is known from Niger and Mali. Because Phosphatosaurus is only known from Paleogene localities, the close relationship with Sokotosuchus implies that there is a long ghost lineage extending back into the Maastrichtian that is not known in the fossil record.[1]
Phosphatosaurus is a large dyrosaurid estimated at 9 m (30 ft) in length,[4][5] with blunt teeth.[1][2][6] The tip of the snout is spoon-shaped from a lateral expansion of the rostral portion of the mandible. The dentition is nonhomodont. Alveolar "couplets" are present in the lower jaw of Phosphatosaurus in which paired tooth sockets, or alveoli, are closer to one another than to the alveoli next to them. This is not seen in any other dyrosaurid but is seen in some other longirostrine (long snouted) crocodylomorphs such as the gavialoidEosuchus.[7] It is possible that the diastemata between the couplets served to receive larger maxillary teeth.[1]
Phosphatosaurus was assigned in 1979 to the newly named subfamilyPhosphatosaurinae by Eric Buffetaut, who considered the subfamily to be the clade formed by Phosphatosaurus and the closely related Sokotosaurus.[8] However, other authors of more recent studies have been tentative in considering the taxon valid because there is currently little knowledge of the anatomy of either genus.[6]
Phosphatosaurus is considered to be a basal dyrosaurid, and is often positioned near the base of phylogenetic trees of dyrosaurids. An early phylogenetic analysis by Buffetaut (1978), not based on a cladistic data matrix, puts Phosphatosaurus at the base of the tree due to the presence of many primitive characters in the genus.[4] Later phylogenetic analyses, such as the one by Jouve (2005), have also shown Phosphatosaurus to be a basal member of the family.[9] In most analyses, Phosphatosaurus and Sokotosuchus form a clade. These two genera are more closely related to one another than to any other genus of dyrosaurid. More recent phylogenetic studies have considered Chenanisuchus, a short-snouted dyrosairid named in 2005, to be even more basal than the clade containing Phosphatosaurus and Sokotosuchus.[10]
^ abBergounioux, F. M. (1956). "Les reptiles fossiles des dépôts phosphatés sud tunisiens". Annales des Mines et de la Géologie. 15: 105.
^Buffetaut, E. (1979). "Présence du Crocodilien Phosphatosaurus (Mesosuchia, Dyrosauridae) dans le Paléocène du Niger et du Mali". Paläontologische Zeitschrift. 53 (3–4): 323–333. doi:10.1007/bf02986594. S2CID129809504.
^ abcBuffetaut, E. (1978). "Les Dyrosauridae (Crocodylia, Mesosuchia) des phosphates de l'Eocène inférieur de Tunisie: Dyrosaurus, Rhabdognathus, Phosphatosaurus". Géologie Méditerranéenne. 5 (2): 237–256. doi:10.3406/geolm.1978.1046.
^Brochu, C. A. (2006). "Osteology and phylogenetic significance of Eosuchus minor (Marsh, 1870) new combination, a longirostrine crocodylian from the late Paleocene of North America". Journal of Paleontology. 80: 162–186. doi:10.1666/0022-3360(2006)080[0162:oapsoe]2.0.co;2.
^Buffetaut, E. (1979). "Sokotosuchus ianwilsoni and the evolution of the dyrosaurid crocodilians". The Nigerian Field Monograph. 1: 31–41.
^ abJouve, S. (2005). "A new description of the skull of Dyrosaurus phosphaticus (Thomas, 1893) (Mesoeucrocodylia: Dyrosauridae) from the Lower Eocene of North Africa". Canadian Journal of Earth Sciences. 42 (3): 323–337. Bibcode:2005CaJES..42..323J. doi:10.1139/e05-008.
